Thermodynamics MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Thermodynamics, a fundamental topic in the field of Mechanical Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Thermodynamics MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Thermodynamics mcq questions that explore various aspects of Thermodynamics problems. Each MCQ is crafted to challenge your understanding of Thermodynamics principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Mechanical Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Thermodynamics MCQs are your pathway to success in mastering this essential Mechanical Engineering topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Thermodynamics. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Thermodynamics knowledge to the test? Let's get started with our carefully curated MCQs!

Thermodynamics MCQs | Page 6 of 31

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Q51.
Which of the following statement is incorrect?

a.

The liquid fuels consist of hydrocarbons.

b.

The liquid fuels have higher calorific value than solid fuels.

c.

The solid fuels have higher calorific value than liquid fuels.

d.

A good fuel should have low ignition point.

Discuss
Answer: (c).The solid fuels have higher calorific value than liquid fuels.
Q52.
Which is the incorrect statement about Carnot cycle?

a.

It is used as the alternate standard of comparison of all heat engines.

b.

All the heat engines are based on Carnot cycle.

c.

It provides concept of maximising work output between the two temperature limits.

d.

all of the above

Discuss
Answer: (b).All the heat engines are based on Carnot cycle.
Q53.
When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called

a.

Zeroth law of thermodynamics

b.

First law of thermodynamics

c.

Second law of thermodynamics

d.

Kelvin Planck's law

Discuss
Answer: (a).Zeroth law of thermodynamics
Q54.
The area under the temperature-entropy curve (T - s curve) of any thermodynamic process represents

a.

heat absorbed

b.

heat rejected

c.

either (a) or (b)

d.

none of these

Discuss
Answer: (c).either (a) or (b)
Q55.
The free expansion process is a constant enthalpy process.

a.

Correct

b.

Incorrect

c.

Can't say

d.

None of these

Discuss
Answer: (a).Correct
Q56.
The specific heat at constant volume is

a.

the amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure

b.

the amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume

c.

the amount of heat required to raise the temperature of 1 kg of water through one degree

d.

any one of the above

Discuss
Answer: (b).the amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume
Q57.
The general gas energy equation is (where Q1 - 2 = Heat supplied, dU = Change in internal energy, and W1 - 2 = Work done in heat units)

a.

Q1 - 2 = dU + W1 - 2

b.

Q1 - 2 = dU - W1 - 2

c.

Q1 - 2 = dU/W1 - 2

d.

Q1 - 2 = dU x W1 - 2

Discuss
Answer: (a).Q1 - 2 = dU + W1 - 2
Q58.
The compression ratio for Diesel engines is

a.

3 to 6

b.

5 to 8

c.

15 to 20

d.

20 to 30

Discuss
Answer: (c).15 to 20
Q59.
In an isothermal process,

a.

there is no change in temperature

b.

there is no change in enthalpy

c.

there is no change in internal energy

d.

all of these

Discuss
Answer: (d).all of these
Q60.
Which of the following is the correct statement of the second law of thermodynamics?

a.

It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work.

b.

It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source.

c.

There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy.

d.

all of the above

Discuss
Answer: (d).all of the above
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